Most Helpful Guy
could be something innocent. Sometimes texts fail to send, sometimes, you read them and mean to reply later but never get around to it, could be he's just super busy lately or, my main guess, he didn't see your text until it was already too late.
You do sound like you're being a bit over eager I must say, planning things for TONIGHT or tomorrow. You should plan for things further down the line, a lot easier to agree to a plan someone suggests if its "Lets go drinking next weekend!" rather than it happening today- I hate changing my plans on the day, especially if its for something so major as seeing a girl I'm interested in.